Cummins Onan QG series

Onan 4.0HGLDA

4,000-watt RV genset, dual fuel (gasoline / lp), 120/240V. The generator most coaches are built around.

Representative manufacturer image of the range. Enclosure finish, color and dimensions vary by model and configuration — see the specifications below for this unit.

4,000W Dual Fuel (Gasoline / LP) 120/240V · 33.3A 30A

Onan is the genset the RV industry standardized on, which has a practical consequence beyond brand preference: parts, filters and service documentation are available everywhere, and any competent RV shop in the country has worked on one. That is worth real money the first time something fails three states from home.

At 4,000 watts this unit will run one 13,500 BTU rooftop air conditioner plus lights, converter and small appliances. Air conditioning is almost always the deciding load in a coach, and the surge at startup - not the steady draw - is what sets the requirement.

Installation into a coach depends on the chassis: whether a generator bay already exists, how the fuel pickup is arranged, and how exhaust is routed. We can quote installation locally, or ship the unit to your shop.

Pricing

Price on request

We are confirming published pricing for this line with the distributor. Call or send an enquiry and we will quote it directly.

Part number	A079R893
Output	4,000 W
Amperage	33.3 A
Voltage	120/240 V · 60 Hz
Fuel	Dual Fuel (Gasoline / LP)
Breaker	30A
CARB	Not CARB compliant

Check availability Or call (214) 957-4307

Questions about the 4.0HGLDA

How much is the Onan 4.0HGLDA?

We quote the 4.0HGLDA directly rather than listing a price. Call or send an enquiry and we will give you a number for the genset, and separately for fitting it if you want that done here.

Will the 4.0HGLDA run my RV air conditioning?

At 4,000 watts it will run one 13,500 BTU rooftop air conditioner plus lights, converter and small appliances. Rooftop air conditioners draw a large surge on startup, so the practical limit is usually the starting load rather than the running load. A soft-start module on the AC changes that math considerably and is often cheaper than moving up a generator size.

What fuel does the 4.0HGLDA use?

Dual Fuel (Gasoline / LP). Dual fuel gives you the flexibility to run from the coach gasoline tank or from an LP bottle, which matters when one of the two is scarce.

Is the 4.0HGLDA CARB compliant?

No. This model is not CARB compliant and cannot be sold new into California or CARB-aligned states. For Texas use that is not a restriction, but it is worth knowing if you may resell the coach across state lines.